<!DOCTYPE html>
<html lang="zh-cmn-Hans">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
    <script src="/monitoring.js"></script>
    <style>
      body {
        background-color: #eee;
      }
      .red {
        width: 200px;
        height: 200px;
        background-color: red;
      }
    </style>
  </head>
  <body>
    <div class="red"></div>

    <div><span>12345</span></div>
    <div><span>12345</span></div>
    <h1 elementtiming="meaningful">最有意义的元素</h1>
    <input type="text" />
    <div><span>12345</span></div>
    <div><span>12345</span></div>
    <div class="red">12345</div>
  </body>
</html>
